Also, the trilogy is set 30 years after Babylon's Ashes, so even if I'd have liked the TV show to continue after book 6, it finished in a way that doesn't leave any major cliffhangers.
I'm still hoping they'll simply continue the show 30 years after the last season, so that all actors have the right age. Although
Spoiler for book 7
Duarte hasn't aged because of protomolecule treatment, so that one would still need another actor or a lot of makeup